The English term "obscure, dark, darkness, murk" matches the Dutch term "donker"

other english words that include "obscure" : dutch :
obscure obscuur
obscure, unknown onbekend
other english words that include "darkness" : dutch :
indistinct, murk, darkness duister
darkness, murk duisternis
other english words that include "murk" : dutch :
indistinct, murk, darkness duister
darkness, murk duisternis